| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide ultra-low expansion coefficient silica/titania glass having reduced striae. <P>SOLUTION: In this method, glass is heat-treated at a temperature over 1,600°C for 72-288 hours. In an example of this method, glass is heat-treated without flowing nor moving. By this method, the size of the striae in the ultra-low expansion coefficient glass is reduced by 500%, especially the striae at a high frequency can be reduced for the most part. <P>COPYRIGHT: (C)2007,JPO&INPIT |
